Appeal No. 1994-3610
Application 07/805,474
This is a decision on appeal under 35 U.S.C. § 134 from the final rejection of claims 1-23, 26-
31, 33-34 and 37-43. Claims 25, 32 and 35-36 have been cancelled. Claim 24 has been allowed by
the examiner. 2
The amendment after final rejection filed June 25, 1993, has been entered. The Reply Brief 3
filed June 9, 1994, has also been entered.4
The claimed invention is directed to a method and apparatus for controlling capacitive input
power switching devices. Representative independent claim 41 is reproduced as follows:
41. A method of controlling a power switching device having a capacitive gate control
input, comprising:
providing a transformer having a preselected amount of leakage inductance;
providing a unidirectional conducting device connected between a secondary winding of the
transformer and the capacitive gate control input;
turning on the power switching device by closing and opening a first switching device to connect
a voltage source to a primary winding of the transformer to cause selected quantized forward energy
transfer from the voltage source to charge the capacitive gate control input to a voltage greater than a
reflected source voltage established by the voltage source and the transformer; and
turning off the power switching device by discharging the capacitive gate control input in
response to the opened or closed state of the first switching device.
2Although claim 24 was rejected in the Final Rejection mailed February 4, 1993, the claim was
indicated as being allowable in the Examiner’s Answer (page 1) mailed April 6, 1994.
3 See the Advisory Action mailed July 22, 1993.
4 See the Examiner’s communication (PTOL-90) mailed June 30, 1994.
2
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